EP0537417A1 - Lost pattern and process for making the same - Google Patents

Lost pattern and process for making the same Download PDF

Info

Publication number
EP0537417A1
EP0537417A1 EP92110719A EP92110719A EP0537417A1 EP 0537417 A1 EP0537417 A1 EP 0537417A1 EP 92110719 A EP92110719 A EP 92110719A EP 92110719 A EP92110719 A EP 92110719A EP 0537417 A1 EP0537417 A1 EP 0537417A1
Authority
EP
European Patent Office
Prior art keywords
model
low
shell
melting material
light
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP92110719A
Other languages
German (de)
French (fr)
Other versions
EP0537417B1 (en
Inventor
Wolfgang Dr. Schneider
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Deutsche Babcock Borsig AG
Original Assignee
Deutsche Babcock Borsig AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Deutsche Babcock Borsig AG filed Critical Deutsche Babcock Borsig AG
Publication of EP0537417A1 publication Critical patent/EP0537417A1/en
Application granted granted Critical
Publication of EP0537417B1 publication Critical patent/EP0537417B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/02—Lost patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y80/00—Products made by additive manufacturing

Definitions

  • the invention relates to a lost model made of a low-melting material for the investment casting of metal and a method for its production.
  • the lost model consists of a low-melting material, such as wax or z. B. Sn, Bi, Sb and other metals containing MCP alloys. Such models are cast and, after solidification to form the casting mold, are backfilled in a mold box with sand or another ceramic material provided with binders. After the low-melting material has melted out of the casting mold, the casting cavity is created (Dubbel: Taschenbuch für den Maschinenbau, 14th edition, Springer-Verlag 1981, pages 946 to 949).
  • the production of the lost models could be simplified if the models could be manufactured without tools according to the stereolithography principle (US Pat. No. 4,575,330).
  • This method uses a laser beam that is controlled directly by a computer-aided (CAD) design drawing and a process computer.
  • the UV light from the laser beam is directed at liquid monomer, which is located in a tub provided with a vertically adjustable, perforated plate.
  • the monomer hardens under the influence of the UV light of the laser beam by polymerization and forms a solid polymer which is no longer soluble in the liquid phase.
  • the controlled laser beam builds up a body in layers according to the drawing on the perforated plate immersed in the liquid bath of the tub at a shallow depth.
  • the object of the invention is to use stereolithography to produce such a model which is dimensionally accurate and does not cause any damage to the casting mold when it melts.
  • the surfaces that are crucial for the casting to be manufactured according to the model are designed to be dimensionally accurate.
  • the self-supporting shell made of laser-hardened polymer is used to hold the low-melting material. This material compensates for thermal expansion of the light-curing polymer of the shell when it melts out of the casting mold by rapidly becoming liquid. This reliably prevents the mold from bursting.
  • the model shown in the drawing is the model for an impeller of a turbocompressor.
  • Such an impeller consists of a hub disk and a cover disk, between which convoluted blades are arranged.
  • the hub disc, the cover disc and the blades limit the flow cross-section of the impeller.
  • the hub disc is provided with a central hole that later receives the drive shaft of the turbo compressor.
  • the reference number 1 indicates the part of the model corresponding to the hub disk of the impeller.
  • the part designated by reference number 2 corresponds to the blades and the part designated by 3 corresponds to the cover plate.
  • the model consists of a self-supporting, thin shell 4, 5 made of light-curing polymer.
  • This shell 4, 5 is produced without tools with the aid of a laser beam controlled directly via a computer-aided design drawing by curing the liquid polymer according to the known stereolithography method discussed in the introduction to the description.
  • the shell part 4 forms the outer shape of the hub disc 2 and the shell part 5 the outer shape of the cover disc 3. These surfaces delimited by the shell 4, 5 determine the shape and limit the flow cross section in the later cast impeller.
  • the interior enclosed by the shell 4, 5 is filled with a low-melting material to such an extent that, after solidification, the subordinate surfaces 6, 7 of the model are limited by the surface of the low-melting material.
  • These surfaces 6, 7 are the sides of the hub disk and the cover disk of the later impeller facing away from the flow cross section. Wax or an alloy of bismuth and tin is used as the low-melting material.
  • the blades can also be made in the manner described above.
  • the part of the model corresponding to the blade 2 consists of a shell 8 made of light-curing polymer.
  • the interior 9 of the shell 8 is filled with the low-melting material.
  • Very thin-walled parts such as the blades 2 according to FIG. 3 or struts, can no longer be made hollow using the method described above.
  • a solid core 10 made of light-curing polymer is produced with the aid of the laser beam.
  • This core 10 is surrounded by a layer 11 of low-melting material.
  • the hub disc is provided with a central hole that later receives the drive shaft of the turbo compressor.
  • the reference number 1 indicates the part of the model corresponding to the hub disk of the impeller.
  • the part designated by reference number 2 corresponds to the blades and the part designated by 3 corresponds to the cover plate.
  • the model consists of a self-supporting, thin shell 4, 5 made of light-curing polymer.
  • This shell 4, 5 is produced without tools with the aid of a laser beam controlled directly via a computer-aided design drawing by curing the liquid polymer according to the known stereolithography method discussed in the introduction to the description.
  • the shell part 4 forms the outer shape of the hub disc 2 and the shell part 5 the outer shape of the cover disc 3. These surfaces delimited by the shell 4, 5 determine the shape and limit the flow cross section in the later cast impeller.
  • the interior enclosed by the shell 4, 5 is filled with a low-melting material to such an extent that, after solidification, the subordinate surfaces 6, 7 of the model are limited by the surface of the low-melting material.
  • These surfaces 6, 7 are the sides of the hub disk and the cover disk of the later impeller facing away from the flow cross section. Wax or an alloy of bismuth and tin is used as the low-melting material.
  • the blades can also be made in the manner described above.
  • the part of the model corresponding to the blade 2 consists of a shell 8 made of light-curing polymer.
  • the interior 9 of the shell 8 is filled with the low-melting material.
  • Very thin-walled parts such as the blades 2 according to FIG. 3 or struts, can no longer be made hollow using the method described above.
  • a solid core 10 made of light-curing polymer is produced with the aid of the laser beam.
  • This core 10 is surrounded by a layer 11 of low-melting material. Also compensated for when melting the In the casting mold, the low-melting material through rapid liquidation expands the thermal expansion of the core 10 made of light-curing polymer.

Abstract

Die formbestimmenden Oberflächen eines verlorenen Modells für den Feinguß von Metall bestehen aus einer dünnwandigen, selbsttragenden Schale (4, 5), deren Innenraum mit einem niedrigschmelzenden Material ausgefüllt ist. Dabei sind die nicht formbestimmenden Oberflächen (6, 7) des Modells durch das niedrigschmelzende Material begrenzt. Die dünnwandige Schale (4, 5) ist aus einem lichthärtendem Polymer mit Hilfe eines über eine rechnerunterstützte Konstruktionszeichnung direkt gesteuerten Laserstrahles gefertigt. <IMAGE>The shape-determining surfaces of a lost model for the investment casting of metal consist of a thin-walled, self-supporting shell (4, 5), the interior of which is filled with a low-melting material. The non-shape-defining surfaces (6, 7) of the model are limited by the low-melting material. The thin-walled shell (4, 5) is made of a light-curing polymer using a laser beam that is directly controlled by a computer-aided design drawing. <IMAGE>

Description

Die Erfindung betrifft ein verlorenes Modell aus einem niedrigschmelzenden Material für den Feinguß von Metall und ein Verfahren zu seiner Herstellung.The invention relates to a lost model made of a low-melting material for the investment casting of metal and a method for its production.

Verlorene Modelle in verlorenen Gießformen werden verwendet, wenn das zu fertigende Formteil eine komplexe Gestalt aufweist und ein enger Toleranzbereich eingehalten werden muß. Das verlorene Modell besteht aus einem niedrigschmelzenden Material, wie Wachs oder aus z. B. Sn, Bi, Sb und andere Metalle enthaltenden MCP-Legierungen. Derartige Modelle werden gegossen und nach dem Erstarren zur Bildung der Gießform in einem Formkasten mit Sand oder einem anderen mit Bindemitteln versehenen keramischen Material hinterfüllt. Nach dem Ausschmelzen des niedrigschmelzenden Materials aus der Gießform entsteht der Gießhohlraum (Dubbel: Taschenbuch für den Maschinenbau, 14. Auflage, Springer-Verlag 1981, Seiten 946 bis 949).Lost models in lost molds are used when the molded part to be manufactured has a complex shape and a narrow tolerance range must be observed. The lost model consists of a low-melting material, such as wax or z. B. Sn, Bi, Sb and other metals containing MCP alloys. Such models are cast and, after solidification to form the casting mold, are backfilled in a mold box with sand or another ceramic material provided with binders. After the low-melting material has melted out of the casting mold, the casting cavity is created (Dubbel: Taschenbuch für den Maschinenbau, 14th edition, Springer-Verlag 1981, pages 946 to 949).

Die Herstellung der verlorenen Modelle ließe sich vereinfachen, wenn die Modelle ohne Werkzeug nach dem Prinzip der Stereolithographie gefertigt werden könnten (US-PS 45 75 330). Bei diesem Verfahren wird ein Laserstrahl verwendet, der direkt über eine rechnerunterstützte (CAD) Konstruktionszeichnung und einen Prozeßrechner gesteuert wird. Das UV-Licht des Laserstrahles wird auf flüssiges Monomer gerichtet, das sich in einer mit einer vertikal verstellbaren, perforierten Platte versehenen Wanne befindet. Das Monomer erhärtet unter dem Einfluß des UV-Lichtes des Laserstrahles durch Polymerisation und bildet ein festes, in der flüssigen Phase nicht mehr lösliches Polymer. Der gesteuerte Laserstrahl baut aufgrund dieser Reaktion auf der mit geringer Tiefe in das Flüssigkeitsbad der Wanne eintauchenden, perforierten Platte einen Körper entsprechend der Zeichnung schichtweise auf. Auf diese Weise lassen sich auch verlorene Modelle mit hoher Maßgenauigkeit herstellen. Eine solche Herstellung weist jedoch den Nachteil auf, daß die Herstellung eines vollwandigen Modelles sehr aufwendig ist, da die Herstellungszeit von dem Volumen des zu härtenden Materials abhängt. Außerdem würde das lichthärtende Polymer beim Ausschmelzen des Modells aus der Gießform sich zunächst stark ausdehnen, bevor er schmilzt. Damit besteht die Gefahr, daß die Gießform beim Ausschmelzen des Modelles gesprengt würde.The production of the lost models could be simplified if the models could be manufactured without tools according to the stereolithography principle (US Pat. No. 4,575,330). This method uses a laser beam that is controlled directly by a computer-aided (CAD) design drawing and a process computer. The UV light from the laser beam is directed at liquid monomer, which is located in a tub provided with a vertically adjustable, perforated plate. The monomer hardens under the influence of the UV light of the laser beam by polymerization and forms a solid polymer which is no longer soluble in the liquid phase. As a result of this reaction, the controlled laser beam builds up a body in layers according to the drawing on the perforated plate immersed in the liquid bath of the tub at a shallow depth. In this way, even lost models can be manufactured with high dimensional accuracy. However, such a production has the disadvantage that the production of a full-walled model is very complex, since the production time depends on the volume of the material to be hardened. In addition, the light-curing polymer would melt when the model melted out of the mold stretch hard before it melts. There is therefore a risk that the mold would be blown up when the model melted out.

Der Erfindung liegt die Aufgabe zugrunde, mit Hilfe der Stereolithographie ein solches Modell herzustellen, das maßgenau ist und beim Ausschmelzen keine Schäden in der Gießform herbeiführt.The object of the invention is to use stereolithography to produce such a model which is dimensionally accurate and does not cause any damage to the casting mold when it melts.

Diese Aufgabe wird erfindungsgemäß durch ein Modell mit den kennzeichnenden Merkmalen des Patentanspruches 1 gelöst. Eine vorteilhafte Ausgestaltung der Erfindung ist in dem Patentanspruch 2 angegeben. Ein Verfahren zur Herstellung des Modells ist Gegenstand des Patentanspruches 3.This object is achieved by a model with the characterizing features of claim 1. An advantageous embodiment of the invention is specified in claim 2. A method for producing the model is the subject of claim 3.

Bei dem erfindungsgemäß hergestellten bzw. ausgebildeten Modell sind die Flächen, auf die es bei dem nach dem Modell zu fertigenden Gußstück entscheidend ankommt, maßgenau gestaltet. Die selbsttragende Schale aus laserlichtgehärtetem Polymer dient der Aufnahme des niedrigschmelzenden Materials. Dieses Material kompensiert beim Ausschmelzen aus der Gießform durch ein schnelles Flüssigwerden eine Wärmedehnung des lichthärtenden Polymers der Schale. Ein Platzen der Gießform wird auf diese Weise sicher verhindert.In the model manufactured or designed according to the invention, the surfaces that are crucial for the casting to be manufactured according to the model are designed to be dimensionally accurate. The self-supporting shell made of laser-hardened polymer is used to hold the low-melting material. This material compensates for thermal expansion of the light-curing polymer of the shell when it melts out of the casting mold by rapidly becoming liquid. This reliably prevents the mold from bursting.

Mehrere Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und werden im folgenden näher erläutert. Es zeigen:

Fig. 1
den Längsschnitt durch ein Modell,
Fig. 2
die teilweise Draufsicht auf Fig. 1 und
Fig. 3
die teilweise Draufsicht auf Fig. 1 gemäß einer anderen Ausführungsform.
Several embodiments of the invention are shown in the drawing and are explained in more detail below. Show it:
Fig. 1
the longitudinal section through a model,
Fig. 2
the partial plan view of Fig. 1 and
Fig. 3
the partial plan view of Fig. 1 according to another embodiment.

Das in der Zeichnung dargestellte Modell ist das Modell für ein Laufrad eines Turboverdichters. Ein solches Laufrad besteht aus einer Nabenscheibe und einer Deckscheibe, zwischen denen gewundene Schaufeln angeordnet sind. Die Nabenscheibe, die Deckscheibe und die Schaufeln begrenzen den Strömungsquerschnitt des Laufrades. Die Nabenscheibe ist mit einer zentralen Bohrung versehen, die später die Antriebswelle des Turboverdichters aufnimmt. In der Zeichnung weist die Bezugsziffer 1 auf das der Nabenscheibe des Laufrades entsprechende Teil des Modelles hin. Das mit der Bezugsziffer 2 bezeichnete Teil entspricht den Schaufeln, und das mit 3 bezeichnete Teil entspricht der Deckscheibe.The model shown in the drawing is the model for an impeller of a turbocompressor. Such an impeller consists of a hub disk and a cover disk, between which convoluted blades are arranged. The hub disc, the cover disc and the blades limit the flow cross-section of the impeller. The The hub disc is provided with a central hole that later receives the drive shaft of the turbo compressor. In the drawing, the reference number 1 indicates the part of the model corresponding to the hub disk of the impeller. The part designated by reference number 2 corresponds to the blades and the part designated by 3 corresponds to the cover plate.

Das Modell besteht aus einer selbsttragenden, dünnen Schale 4, 5 aus lichthärtendem Polymer. Diese Schale 4, 5 wird ohne Werkzeug mit Hilfe eines direkt über eine rechnergestützte Konstruktionszeichnung gesteuerten Laserstrahles durch Härten des flüssigen Polymers nach dem in der Beschreibungseinleitung erörterten, bekannten Verfahren der Stereolithographie hergestellt. Dabei bildet das Schalenteil 4 die äußere Form der Nabenscheibe 2 und das Schalenteil 5 die äußere Form der Deckscheibe 3. Diese von der Schale 4, 5 begrenzten Flächen sind formbestimmend und begrenzen in dem später gegossenen Laufrad den Strömungsquerschnitt.The model consists of a self-supporting, thin shell 4, 5 made of light-curing polymer. This shell 4, 5 is produced without tools with the aid of a laser beam controlled directly via a computer-aided design drawing by curing the liquid polymer according to the known stereolithography method discussed in the introduction to the description. The shell part 4 forms the outer shape of the hub disc 2 and the shell part 5 the outer shape of the cover disc 3. These surfaces delimited by the shell 4, 5 determine the shape and limit the flow cross section in the later cast impeller.

Der von der Schale 4, 5 umschlossene Innenraum wird mit einem niedrigschmelzenden Material soweit gefüllt, daß nach der Verfestigung die untergeordneten Flächen 6, 7 des Modells durch die Oberfläche des niedrigschmelzenden Materials begrenzt sind. Diese Flächen 6, 7 sind die dem Strömungsquerschnitt abgewandten Seiten der Nabenscheibe und der Deckscheibe des späteren Laufrades. Als niedrigschmelzendes Material wird Wachs oder eine Legierung aus Wismut und Zinn verwendet.The interior enclosed by the shell 4, 5 is filled with a low-melting material to such an extent that, after solidification, the subordinate surfaces 6, 7 of the model are limited by the surface of the low-melting material. These surfaces 6, 7 are the sides of the hub disk and the cover disk of the later impeller facing away from the flow cross section. Wax or an alloy of bismuth and tin is used as the low-melting material.

Die Schaufeln können ebenfalls in der oben beschriebenen Weise hergestellt werden. Wie aus Fig. 2 zu erkennen ist, besteht das der Schaufel 2 entsprechende Teil des Modells aus einer Schale 8 aus lichthärtendem Polymer. Der Innenraum 9 der Schale 8 ist mit dem niedrigschmelzenden Material ausgefüllt.The blades can also be made in the manner described above. As can be seen from FIG. 2, the part of the model corresponding to the blade 2 consists of a shell 8 made of light-curing polymer. The interior 9 of the shell 8 is filled with the low-melting material.

Sehr dünnwandige Teile, wie die Schaufeln 2 gemäß Fig. 3 oder Verstrebungen können mit Hilfe des oben beschriebenen Verfahrens nicht mehr hohl gefertigt werden. In diesem Fall wird mit Hilfe des Laserstrahles ein massiver Kern 10 aus lichthärtendem Polymer erzeugt. Dieser Kern 10 wird mit einer Schicht 11 aus niedrigschmelzendem Material umgeben. Auch hierbei kompensiert beim Ausschmelzen des Nabenscheibe ist mit einer zentralen Bohrung versehen, die später die Antriebswelle des Turboverdichters aufnimmt. In der Zeichnung weist die Bezugsziffer 1 auf das der Nabenscheibe des Laufrades entsprechende Teil des Modelles hin. Das mit der Bezugsziffer 2 bezeichnete Teil entspricht den Schaufeln, und das mit 3 bezeichnete Teil entspricht der Deckscheibe.Very thin-walled parts, such as the blades 2 according to FIG. 3 or struts, can no longer be made hollow using the method described above. In this case, a solid core 10 made of light-curing polymer is produced with the aid of the laser beam. This core 10 is surrounded by a layer 11 of low-melting material. Also compensated for when melting the The hub disc is provided with a central hole that later receives the drive shaft of the turbo compressor. In the drawing, the reference number 1 indicates the part of the model corresponding to the hub disk of the impeller. The part designated by reference number 2 corresponds to the blades and the part designated by 3 corresponds to the cover plate.

Das Modell besteht aus einer selbsttragenden, dünnen Schale 4, 5 aus lichthärtendem Polymer. Diese Schale 4, 5 wird ohne Werkzeug mit Hilfe eines direkt über eine rechnergestützte Konstruktionszeichnung gesteuerten Laserstrahles durch Härten des flüssigen Polymers nach dem in der Beschreibungseinleitung erörterten, bekannten Verfahren der Stereolithographie hergestellt. Dabei bildet das Schalenteil 4 die äußere Form der Nabenscheibe 2 und das Schalenteil 5 die äußere Form der Deckscheibe 3. Diese von der Schale 4, 5 begrenzten Flächen sind formbestimmend und begrenzen in dem später gegossenen Laufrad den Strömungsquerschnitt.The model consists of a self-supporting, thin shell 4, 5 made of light-curing polymer. This shell 4, 5 is produced without tools with the aid of a laser beam controlled directly via a computer-aided design drawing by curing the liquid polymer according to the known stereolithography method discussed in the introduction to the description. The shell part 4 forms the outer shape of the hub disc 2 and the shell part 5 the outer shape of the cover disc 3. These surfaces delimited by the shell 4, 5 determine the shape and limit the flow cross section in the later cast impeller.

Der von der Schale 4, 5 umschlossene Innenraum wird mit einem niedrigschmelzenden Material soweit gefüllt, daß nach der Verfestigung die untergeordneten Flächen 6, 7 des Modells durch die Oberfläche des niedrigschmelzenden Materials begrenzt sind. Diese Flächen 6, 7 sind die dem Strömungsquerschnitt abgewandten Seiten der Nabenscheibe und der Deckscheibe des späteren Laufrades. Als niedrigschmelzendes Material wird Wachs oder eine Legierung aus Wismut und Zinn verwendet.The interior enclosed by the shell 4, 5 is filled with a low-melting material to such an extent that, after solidification, the subordinate surfaces 6, 7 of the model are limited by the surface of the low-melting material. These surfaces 6, 7 are the sides of the hub disk and the cover disk of the later impeller facing away from the flow cross section. Wax or an alloy of bismuth and tin is used as the low-melting material.

Die Schaufeln können ebenfalls in der oben beschriebenen Weise hergestellt werden. Wie aus Fig. 2 zu erkennen ist, besteht das der Schaufel 2 entsprechende Teil des Modells aus einer Schale 8 aus lichthärtendem Polymer. Der Innenraum 9 der Schale 8 ist mit dem niedrigschmelzenden Material ausgefüllt.The blades can also be made in the manner described above. As can be seen from FIG. 2, the part of the model corresponding to the blade 2 consists of a shell 8 made of light-curing polymer. The interior 9 of the shell 8 is filled with the low-melting material.

Sehr dünnwandige Teile, wie die Schaufeln 2 gemäß Fig. 3 oder Verstrebungen können mit Hilfe des oben beschriebenen Verfahrens nicht mehr hohl gefertigt werden. In diesem Fall wird mit Hilfe des Laserstrahles ein massiver Kern 10 aus lichthärtendem Polymer erzeugt. Dieser Kern 10 wird mit einer Schicht 11 aus niedrigschmelzendem Material umgeben. Auch hierbei kompensiert beim Ausschmelzen des Modells in der Gießform das niedrigschmelzende Material durch schnelles Flüssigwerden die Wärmedehnung des aus lichthärtendem Polymer bestehendes Kernes 10.Very thin-walled parts, such as the blades 2 according to FIG. 3 or struts, can no longer be made hollow using the method described above. In this case, a solid core 10 made of light-curing polymer is produced with the aid of the laser beam. This core 10 is surrounded by a layer 11 of low-melting material. Also compensated for when melting the In the casting mold, the low-melting material through rapid liquidation expands the thermal expansion of the core 10 made of light-curing polymer.

Claims (3)

Verlorenes, aus niedrigschmelzendem Material bestehendes Modell für den Feinguß von Metall, dadurch gekennzeichnet, daß die formgebenden Oberflächen des Modells aus einer dünnwandigen, selbsttragenden Schale (4, 5) aus einem lichthärtenden Polymer bestehen, daß die Schale (4, 5) mit Hilfe eines über eine rechnerunterstützte Konstruktionszeichnung direkt gesteuerten Laserstrahles gefertigt ist, daß der Innenraum der Schale (4, 5) von dem niedrigschmelzenden Material ausgefüllt ist und daß die nicht formgebenden Oberflächen (6, 7) des Modells durch das niedrigschmelzende Material begrenzt sind.Lost, low-melting material model for the investment casting of metal, characterized in that the shaping surfaces of the model consist of a thin-walled, self-supporting shell (4, 5) made of a light-curing polymer, that the shell (4, 5) using a Via a computer-aided design drawing, a directly controlled laser beam is produced such that the interior of the shell (4, 5) is filled with the low-melting material and that the non-shaping surfaces (6, 7) of the model are limited by the low-melting material. Modell nach Anspruch 1, dadurch gekennzeichnet, daß dünnwandige Teile des Modells aus einem massiven, aus einem lichthärtendem Polymer mit Hilfe des Laserstrahles gefertigten Kern (10) bestehen, der von einer Schicht (11) aus dem niedrigschmelzenden Material umgeben ist.Model according to claim 1, characterized in that thin-walled parts of the model consist of a solid core (10) made of a light-curing polymer using the laser beam and surrounded by a layer (11) made of the low-melting material. Verfahren zur Herstellung eines verlorenen, aus einem niedrigschmelzenden Material bestehenden Modells für den Feinguß von Metall gemäß Patentanspruch 1, dadurch gekennzeichnet, daß die formgebenden Oberflächen des Modells als selbsttragende, dünnwandige Schale aus einem lichthärtenden Polymer mit Hilfe eines über eine rechnerunterstützte Konstruktionszeichnung direkt gesteuerten Laserstrahles hergestellt werden und daß der Innenraum der Schale bis zu den nicht formbestimmenden Oberflächen des Modells mit dem niedrigschmelzenden Material ausgefüllt wird.A process for the production of a lost model, consisting of a low-melting material, for the investment casting of metal according to claim 1, characterized in that the shaping surfaces of the model are produced as a self-supporting, thin-walled shell made of a light-curing polymer with the aid of a laser beam controlled directly by a computer-aided design drawing and that the interior of the shell is filled with the low-melting material up to the non-shape-determining surfaces of the model.
EP92110719A 1991-10-12 1992-06-25 Lost pattern and process for making the same Expired - Lifetime EP0537417B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4133923 1991-10-12
DE4133923A DE4133923A1 (en) 1991-10-12 1991-10-12 LOST MODEL AND METHOD FOR THEIR PRODUCTION

Publications (2)

Publication Number Publication Date
EP0537417A1 true EP0537417A1 (en) 1993-04-21
EP0537417B1 EP0537417B1 (en) 1996-03-13

Family

ID=6442620

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92110719A Expired - Lifetime EP0537417B1 (en) 1991-10-12 1992-06-25 Lost pattern and process for making the same

Country Status (4)

Country Link
US (1) US5277241A (en)
EP (1) EP0537417B1 (en)
JP (1) JP3124387B2 (en)
DE (2) DE4133923A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9405440D0 (en) 1994-03-19 1994-05-04 Schwitzer Europ Ltd Turbochargers
DE4410046C2 (en) * 1994-03-23 2000-11-30 Eos Electro Optical Syst Method and material for producing a three-dimensional object by sintering
US5775412A (en) * 1996-01-11 1998-07-07 Gidding Engineering, Inc. High pressure dense heat transfer area heat exchanger
US5824250A (en) * 1996-06-28 1998-10-20 Alliedsignal Inc. Gel cast molding with fugitive molds
TW436357B (en) 1997-12-12 2001-05-28 Matsushita Electric Ind Co Ltd Laser drilling equipment and control method
US6663347B2 (en) * 2001-06-06 2003-12-16 Borgwarner, Inc. Cast titanium compressor wheel
CN102091757B (en) * 2010-12-30 2013-01-02 沈阳黎明航空发动机(集团)有限责任公司 Integral precision casting method for large thin-wall casing part
US20170246677A1 (en) * 2016-02-29 2017-08-31 General Electric Company Casting with metal components and metal skin layers

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1337560A (en) * 1962-09-10 1963-09-13 Howe Sound Co Molding process, and device for implementing the same
FR2479044A1 (en) * 1980-03-26 1981-10-02 Rozier Guy Cores for high precision metal casting by lost wax process - made from stable polyurethane or epoxy! resin foam, opt. with central insert e.g. of wax
US4844144A (en) * 1988-08-08 1989-07-04 Desoto, Inc. Investment casting utilizing patterns produced by stereolithography
EP0420614A2 (en) * 1989-09-29 1991-04-03 3D Systems, Inc. Methods of coating stereolithographic parts

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH642877A5 (en) * 1979-11-28 1984-05-15 Zuercher Kantonalbank Method for the production of a model of an object
JPS6021174A (en) * 1983-07-15 1985-02-02 Toyota Motor Corp Production of bottomed hollow body
FR2567668B1 (en) * 1984-07-16 1987-10-16 Cilas Alcatel DEVICE FOR PRODUCING AN INDUSTRIAL PART MODEL
US4575330A (en) * 1984-08-08 1986-03-11 Uvp, Inc. Apparatus for production of three-dimensional objects by stereolithography
US4929402A (en) * 1984-08-08 1990-05-29 3D Systems, Inc. Method for production of three-dimensional objects by stereolithography
JP2930354B2 (en) * 1989-09-11 1999-08-03 三菱重工業株式会社 Casting method using photocurable resin prototype
JPH03182312A (en) * 1989-12-12 1991-08-08 Sekisui Chem Co Ltd Manufacture of mold

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1337560A (en) * 1962-09-10 1963-09-13 Howe Sound Co Molding process, and device for implementing the same
FR2479044A1 (en) * 1980-03-26 1981-10-02 Rozier Guy Cores for high precision metal casting by lost wax process - made from stable polyurethane or epoxy! resin foam, opt. with central insert e.g. of wax
US4844144A (en) * 1988-08-08 1989-07-04 Desoto, Inc. Investment casting utilizing patterns produced by stereolithography
EP0420614A2 (en) * 1989-09-29 1991-04-03 3D Systems, Inc. Methods of coating stereolithographic parts

Also Published As

Publication number Publication date
JP3124387B2 (en) 2001-01-15
DE59205668D1 (en) 1996-04-18
JPH05200483A (en) 1993-08-10
DE4133923A1 (en) 1993-04-15
US5277241A (en) 1994-01-11
EP0537417B1 (en) 1996-03-13

Similar Documents

Publication Publication Date Title
DE4440397C2 (en) Methods of making molds
DE19528215A1 (en) Three=dimensional model or tool mfr. employing rapid prototyping methods - involves building up layers of different materials according to use and processing each layer by a variety of chemical, physical or mechanical methods
DE2536751C3 (en) Process for casting hollow cast bodies from high-temperature alloys, in particular turbine blades
EP1940575B1 (en) Particle size-influencing layer-by-layer manufacturing method
DE19625425C2 (en) Method and device for producing three-dimensional objects in the form of laminated bodies
DE10207279A1 (en) Casting process and casting
EP1970142B1 (en) Method for fine casting of metallic parts with narrow channels
EP0025481B1 (en) Process for the production of castings by investment casting
CN110087796A (en) For making the multi-piece type integration core shell structure of cast member
DE602004000347T2 (en) Casting mold for component casting with directional solidification
DE2831292A1 (en) METHOD FOR PRODUCING A TURBINE BLADE
DE112008003545T5 (en) Casting method for turbine blades
EP3215286A1 (en) Method for manufacturing a compressor impeller
EP0537417B1 (en) Lost pattern and process for making the same
DE102016113246A1 (en) Method and device for producing a metallic material mixture in additive manufacturing
EP1303371B1 (en) Centrifugal casting device
EP2059356B1 (en) Single-part expendable casting mould with a controlled temperature for cast metal parts and associated production method
DE1195910B (en) Process for making cast hollow turbine blades
DE2659224C2 (en) Carrying device for a model for precision casting processes
DE2453090C3 (en) Method and mold for making a cast hollow turbine blade
EP1216770A2 (en) Method and device for casting a mould part used during the fabrication of a turbine blade
DE2534050B2 (en) COMPOSITE CASTING PROCESS
DE10014744B4 (en) Process for the production of metallic molds
EP3616806B1 (en) Method for producing a model form core blank, a model form core and an investment casting molds and a casting method for producing a cast piece with a hollow structure
DE2837286C2 (en) Process for the production of a mask form composed of several parts

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): CH DE FR GB IT LI

17P Request for examination filed

Effective date: 19930311

17Q First examination report despatched

Effective date: 19950822

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): CH DE FR GB IT LI

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19960313

REF Corresponds to:

Ref document number: 59205668

Country of ref document: DE

Date of ref document: 19960418

ET Fr: translation filed
ITF It: translation for a ep patent filed

Owner name: STUDIO JAUMANN

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: FR

Ref legal event code: TP

Ref country code: CH

Ref legal event code: PUE

Owner name: DEUTSCHE BABCOCK- BORSIG AKTIENGESELLSCHAFT -DANN

REG Reference to a national code

Ref country code: GB

Ref legal event code: 732E

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20040528

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 20040602

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20040604

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20040609

Year of fee payment: 13

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050625

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050625

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050630

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050630

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060103

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060228

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20050625

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20060228